public class quer{
	public static void main(String []  orks){
		int n = 0;
		try{
			n = Integer.parseInt(orks [0]);
		}catch(NumberFormatException e){
			System.err.println("Ich bin zu krass fuer Exceptions!");
			System.exit(1);
		}
		System.out.println("Einfache Quersumme = " + quer(n));
		System.out.println("Iterierte Quersumme = " + queriter(n));

	}

	public static int quer(int sum){
		int quer = 0;
		quer += sum%10;
		sum = sum/10;
		if(sum > 9)
			return quer + quer(sum);
		else
			return quer + sum;
	}

	public static int queriter(int n){
		int itq = quer(n);
		if(itq > 9)
			return queriter(itq);
		else
			return itq;
	}
}